HIGH-DOSE CHEMOTHERAPY AND AUTOLOGOUS PBSC TRANSPLANTATION (PBSCT): Beginning 4-6 weeks after completion of leukapheresis, patients receive carmustine IV over 2 hours on day -6, etoposide phosphate IV over 4 hours on day -4, and cyclophosphamide IV over 2 hours on day -2. Patients undergo autologous PBSCT on day 0. Patients also receive G-CSF SC QD beginning on day 4 and continuing until blood counts recover.